Resin brought on mother's twitch (6)
I believe the answer is:
mastic
'resin' is the definition.
(I know that mastic is a plant resin)
'on mother's twitch' is the wordplay.
'on' means one lot of letters go next to another.
'mother's' becomes 'ma's' (ma can mean mother).
'twitch' becomes 'tic' (tic is a kind of twitch).
'mas' put next to 'tic' is 'MASTIC'.
'brought' is the link.
(Other definitions for mastic that I've seen before include "Resin used in varnishes" , "Mac, sit and produce a gum resin" , "Aromatic resin used to make varnish" , "liquor" , "Mouldable cement" .)