Crossword Genius

Details of his pectorals (4)

Ross

I believe the answer is:

spec

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'details' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I can't see?

'of his pectorals' is the wordplay.
'of' indicates a hidden word.
'SPEC' is hidden in the letters of 'his pectorals'.

Can you help me to learn more?

(Other definitions for spec that I've seen before include "Estimate" , "Gamble (colloq.)" , "Instructions" , "Bet" , "Detailed design document (abbr.)" .)

I've seen this clue in The Daily Express and The Mirror.
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