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All answers having "Extra" as clue:

3 Character Answers:

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FLL

GUM

ODD

TOO



4 Character Answers:

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ADDL

ARID

ELSE

MORE

OVER

PERK

PLUS

SUPE



5 Character Answers:

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ADDED

ADDNL

ADDON

BONUS

FRILL

OTHER

SPARE



6 Character Answers:

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UNUSED



7 Character Answers:

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ADDEDIN

ADDEDON

AMENITY

CAPTURE

OVERAGE

SURPLUS

TOSPARE



8 Character Answers:

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NONACTOR



9 Character Answers:

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SPILLOVER



10 Character Answers:

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ADDITIONAL



13 Character Answers:

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SUPERNUMERARY

SUPPLEMENTARY



14 Character Answers:

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READALLABOUTIT