A horse used primarily for manual labor; a draft horse
(by extension) Anyone or anything that does a lot of work; something or someone who works consistently or regularly. Example: Those old machines are not very glamorous, but even 20 years after their introduction, they are still the workhorses of the industry.
All clues having "WORKHORSE"
for an answer:
You can find a list of possible crossword clues for WORKHORSE below.
Crossword Answers