Crossword Genius

Trained oarsmen, they'll complain (7)

Ross

I believe the answer is:

moaners

I'm a little stuck... Click here to teach me more about this clue!

'they'll complain' is the definition.
I can't judge whether this defines the answer.

'trained oarsmen' is the wordplay.
'trained' indicates anagramming the letters (train can mean to shape or manipulate).
'oarsmen' with letters rearranged gives 'MOANERS'.

Can you help me to learn more?

(Another definition for moaners that I've seen is " People crying".)

I've seen this clue in The Everyman puzzle in The Observer.
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