Keen to get going without leader (4)
I believe the answer is:
tart
'keen' is the definition.
(thesaurus)
'get going without leader' is the wordplay.
'get going' becomes 'start' (synonyms).
'without leader' means to remove the first letter.
'start' with its first letter taken away is 'TART'.
'to' is the link.
(Other definitions for tart that I've seen before include "Tom" , "Pie with fruit filling" , "Biting; flan" , "Bitter - pudding" , "quiche, perhaps" .)