Leader of farmers is certain to provide ground rent! (7)
I believe the answer is:
fissure
'ground rent' is the definition.
'fissure' can be an answer for 'rent' (thesaurus). I'm not sure about the 'ground' bit.
'leader of farmers is certain' is the wordplay.
'leader of' suggests taking the first letters.
'certain' becomes 'sure' (synonyms).
The first letter of 'farmers' is 'f'.
'f'+'is'+'sure'='FISSURE'
'to provide' acts as a link.
Can you help me to learn more?
(Other definitions for fissure that I've seen before include "Crevice" , "Deep crack in rock" , "Long, narrow crack" , "Long, narrow opening" , "Cleft" .)