It was possibly waspish (5)

I believe the answer is:

waist

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'it was possibly waspish' is the definition.
The definition suggests a singular noun which matches the answer.

'it was possibly' is the wordplay.
'possibly' is an anagram indicator.
'it'+'was'='itwas'
'itwas' with letters rearranged gives 'WAIST'.

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(Other definitions for waist that I've seen before include "Band may go round here" , "Ever-expanding middle" , "Ship's middle" , "Middle part of a ship" , "Midriff" .)

I've seen this clue in the Evening Standard.

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