Tell lamp is between spaces (9)
I believe the answer is:
enlighten
'tell' is the definition.
(thesaurus)
'lamp is between spaces' is the wordplay.
I cannot quite see how this works, but
'lamp' could be 'light' (I've seen this before) and 'light' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for enlighten that I've seen before include "Illuminate" , "Give knowledge to, inform" , "Instruct" , "Make aware" , "Provide illumination" .)