Explorer finds daughter with libertine (5)
I believe the answer is:
drake
'explorer' is the definition.
(I've seen this before)
'daughter with libertine' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'with' says to put letters next to each other.
'libertine' becomes 'rake' (rake is a kind of libertine).
'd'+'rake'='DRAKE'
'finds' acts as a link.
(Other definitions for drake that I've seen before include "sea captain" , "Male duck - circumnavigator" , "First Englishman to sail round the world" , "Plymouth bowler" , "Nick" .)