Fuse taken out of transformer gently (5)
I believe the answer is:
merge
'fuse' is the definition.
(I know that fuse can be written as merge)
'out of transformer gently' is the wordplay.
'out of' indicates a hidden word.
'MERGE' is hidden in the letters of 'transformer gently'.
'taken' acts as a link.
(Other definitions for merge that I've seen before include "Mix" , "Become combined" , "Blend, coalesce" , "Combine, blend" , "Make one" .)