A bit of silliness in style (5)

I believe the answer is:

lines

'style' is the definition.
(thesaurus)

'a bit of silliness in' is the wordplay.
'a bit of' indicates a hidden word (I've seen 'a bit' mean this (the answer is formed by a bit of the clue)).
'LINES' can be found hidden inside 'silliness in'.

(Other definitions for lines that I've seen before include "imposition" , "form of school punishment" , "Actor's text" , "Ranks" , "Skin wrinkles" .)

I've seen this clue in the Evening Standard.

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