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Dark, cold agent, powerfully built, needing no introduction (11)

Ross

I believe the answer is:

crepuscular

'dark' is the definition.
(similar in meaning)

'cold agent powerfully built needing no introduction' is the wordplay.
'cold' becomes 'C' (eg on taps).
'agent' becomes 'rep' (short for representative).
'powerfully built' becomes 'muscular' (I've seen this before).
'needing no introduction' means to remove the first letter.
'muscular' with its first letter taken off is 'uscular'.
'c'+'rep'+'uscular'='CREPUSCULAR'

I've seen this clue in The Times.
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