Intimidate son interrupting discussion in plant (3,7)
I believe the answer is:
cow parsley
'plant' is the definition.
(cow parsley is a kind of plant)
'intimidate son interrupting discussion' is the wordplay.
'intimidate' becomes 'cow' (cow can mean to bully or intimidate).
'son' becomes 's' (genealogical abbreviation for son).
'interrupting' indicates putting letters inside.
'discussion' becomes 'parley' (parley is a kind of discussion).
's' going within 'parley' is 'parsley'.
'cow'+'parsley'='COW-PARSLEY'
'in' is the link.
(Other definitions for cow parsley that I've seen before include "Hedgerow plant" , "Fragrant white wayside flower" .)