Complaints in muscles overwhelming some guys (7)

I believe the answer is:

laments

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'complaints' is the definition.
(I know this)

'muscles overwhelming some guys' is the wordplay.
'muscles' becomes 'lats' (I can't explain this - if you can you should believe this answer much more).
'overwhelming' means one lot of letters goes inside another.
'some guys' becomes 'men' (guy can mean a man).
'lats' enclosing 'men' is 'LAMENTS'.

'in' is the link.

Can you help me to learn more?

(Other definitions for laments that I've seen before include "complaints" , "Sad songs" , "Bewails" , "elegies" , "Bemoans" .)

I've seen this clue in The Telegraph.

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