They look for a 60s group (7)
I believe the answer is:
seekers
'they' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see a link between them that I can't see?
'look for a 60s group' is the wordplay.
'look for' becomes 'seek' (synonyms).
'a 60s group' becomes 'ers' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'seek'+'ers'='SEEKERS'
Can you help me to learn more?
(Other definitions for seekers that I've seen before include "Searchers" , "Religious group" .)