Should be a bit of a rough time (5)

I believe the answer is:

ought

'should be' is the definition.
(I've seen this before)

'a bit of a rough time' is the wordplay.
'a bit of' says the answer is hidden in the clue.
'OUGHT' is hidden in the letters of 'rough time'.

(Other definitions for ought that I've seen before include "Verb implying duty; zero, nothing (archaic)" , "Tough (anag)" , "Be logically necessary" , "Anything at all (archaic)" , "Strange thing" .)

I've seen this clue in the Evening Standard.

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