Secures new muscles (4)

I believe the answer is:

nabs

'secures' is the definition.

'new muscles' is the wordplay.
'new' becomes 'n'.
'muscles' becomes 'abs' (I've seen this before).
'n'+'abs'='NABS'

(Other definitions for nabs that I've seen before include "Does appropriate" , "Catches in the act" , "Takes or grabs suddenly" , "Arrests" , "Snatches" .)

I've seen this clue in The Times.

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