Leased to some muleteers (3)
I believe the answer is:
let
'leased' is the definition.
(thesaurus)
'some muleteers' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'LET' can be found hidden inside 'muleteers'.
'to' acts as a link.
(Other definitions for let that I've seen before include "Service that must be repeated" , "Was inclined to ignore" , "Allow; tennis fault" , "hired" , "Allow; permit" .)