Picked up another antler (6)
I believe the answer is:
learnt
'picked up' is the definition.
(pick up can mean to learn or discover)
'another antler' is the wordplay.
'another' is an anagram indicator.
'antler' is an anagram of 'LEARNT'.
(Other definitions for learnt that I've seen before include "Found out" , "Memorised" , "Committed to memory" , "Aquired knowledge or skill" , "Acquired by instruction" .)