Discard amateur leading a team (3,5)
I believe the answer is:
lay aside
'discard' is the definition.
(thesaurus)
'amateur leading a team' is the wordplay.
'amateur' becomes 'lay' ('lay' can be similar in meaning to 'amateur'**).
'leading' says to put letters next to each other.
'team' becomes 'side' (I've seen this before).
'lay'+'a'+'side'='LAY ASIDE'
(Other definitions for lay aside that I've seen before include "Abandon - store for future" , "Discard - put by for future use" , "reserve" , "give up!" , "Abandon - save for later" .)