Daring person to cross lake (4)
I believe the answer is:
bold
'daring' is the definition.
(thesaurus)
'person to cross lake' is the wordplay.
'person' becomes 'bod' (I've seen this in other clues**).
'to cross' is an insertion indicator.
'lake' becomes 'l'.
'bod' enclosing 'l' is 'BOLD'.
(Other definitions for bold that I've seen before include "sort of face" , "Thick and heavy (type)" , "Confidently courageous" , "Daring, courageous" , "Brash" .)