Bows were made from it yet were wrongly formed (3,4)
I believe the answer is:
yew tree
'bows were made from it' is the definition.
(I've seen this before)
'yet were wrongly formed' is the wordplay.
'wrongly formed' indicates anagramming the letters (I've seen this in other clues).
'yet'+'were'='yetwere'
'yetwere' anagrammed gives 'YEW-TREE'.
(Other definitions for yew tree that I've seen before include "I might stand by the church" , "Source of many a bow" , "It grows traditionally in churchyards" , "growth ..." , "Timber supplier" .)