Use spare top to go in front (9)
I believe the answer is:
spearhead
'go in front' is the definition.
'spearhead' can be an answer for 'front' (I've seen this before). I'm unsure of the 'go in' bit.
'use spare top' is the wordplay.
'use' indicates anagramming the letters.
'top' becomes 'head' (synonyms).
'spare' with letters rearranged gives 'spear'.
'spear'+'head'='SPEARHEAD'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for spearhead that I've seen before include "Group leading an attack" , "initiate attack" , "tip on manual weapon" , "Vanguard" , "Part of weapon possibly iron" .)