Skirt around black taxi (7)
I believe the answer is:
minicab
'taxi' is the definition.
(I've seen this before)
'skirt around black' is the wordplay.
'skirt' becomes 'mini' (a mini skirt).
'around' becomes 'ca' (circa).
'black' becomes 'b' (as in pencil classifications).
'mini'+'ca'+'b'='MINICAB'
(Other definitions for minicab that I've seen before include "Type of taxi" , "Metered vehicle for hire" , "Type of car hire" , "It can't be hailed in the street" , "Hired vehicle" .)