Famous rocks that lack a name! (7)
I believe the answer is:
needles
'famous rocks' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot see how one could define the other.
'lack a name' is the wordplay.
'lack' becomes 'need' (I've seen this before).
'a name' becomes 'les' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'need'+'les'='NEEDLES'
'that' is the link.
Can you help me to learn more?
(Other definitions for needles that I've seen before include "Christmas tree leaves" , "Is annoying" , "Where a lighthouse is" , "Rocks off Isle of Wight" , "Heckles" .)