Strongly urge sexy shorts must have extremities covered (6)

I believe the answer is:

exhort

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'strongly urge' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for exhort that I've seen before include "Entreat earnestly, urge" , "Urge, counsel earnestly" , "Strongly urge (someone to do something)" , "Strongly encourage (someone to action)" , "Urge strongly and sincerely" .)

I've seen this clue in The Times.

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