Strive in Queer Street to find napkin (9)
I believe the answer is:
serviette
'napkin' is the definition.
(synonyms)
'strive in queer street' is the wordplay.
'strive' becomes 'vie' (I've seen this in another clue).
'in' means one lot of letters goes inside another.
'queer' is an anagram indicator.
'street' anagrammed gives 'sertte'.
'vie' inserted into 'sertte' is 'SERVIETTE'.
'to find' is the link.
(Other definitions for serviette that I've seen before include "* [MATERIAL]" , "Personal protection" , "Table napkin" , "This may give you some protection" , "Consumer protection" .)