A growing girl, like Heather (5)
I believe the answer is:
erica
This could be a double definition.
'a growing girl' is the first definition.
'Erica' can be an answer for 'girl'. I'm not certain of the 'a growing' bit.
'heather' is the second definition.
(the plant genus Erica includes heather plants)
'like' is the link.
Can you help me to learn more?
(Other definitions for erica that I've seen before include "Heather's Latin name?" , "Shrubs" , "growing up on the moors" , "hardy shrub" , "Female" .)