Bush grew bark (7)
I believe the answer is:
rosebay
'bush' is the definition.
(rosebay is a kind of bush)
'grew bark' is the wordplay.
'grew' becomes 'rose' (I've seen this before).
'bark' becomes 'bay' (baying is a kind of barking).
'rose'+'bay'='ROSEBAY'
(Other definitions for rosebay that I've seen before include "Wild plant" , "shrub" , "Willowherb" .)