Muscular type of skinhead gets time, as it's an offence to lose the head (6)

I believe the answer is:

strong

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'muscular' is the definition.
('strong' can be similar in meaning to 'muscular')

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for strong that I've seen before include "curator" , "Convincing" , "Not easily broken" , "Able to withstand attack" , "Great in power" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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