Lively male ejected from Blenheim outing (6)
I believe the answer is:
nimble
'lively' is the definition.
(thesaurus)
'male ejected from blenheim outing' is the wordplay.
'male' becomes 'he' (he refers to a man).
'ejected from' indicates named letters should be taken away.
'outing' indicates an anagram (an outing implies travelling).
'blenheim' with 'he' taken away is 'blenim'.
'blenim' with letters rearranged gives 'NIMBLE'.
(Other definitions for nimble that I've seen before include "Light and quick in movement" , "Quick, agile" , "'Agile, spry (6)'" , "Swift, active" , "'Jack be ......, Jack be quick' (6)." .)