Paint or lime on us, perhaps (8)
I believe the answer is:
emulsion
'paint' is the definition.
(I've seen this before)
'lime on us perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'lime'+'on'+'us'='limeonus'
'limeonus' is an anagram of 'EMULSION'.
'or' acts as a link.
(Other definitions for emulsion that I've seen before include "Mixture involving two liquids which do not readily combine" , "Wall paint" , "Mixture of insoluble liquids" , "Type of paint" .)