There’s word of action every so often being at plant (7)
I believe the answer is:
verbena
'plant' is the definition.
(verbena is a kind of plant)
'there's word of action every so often being at' is the wordplay.
'there's' means one lot of letters go next to another.
'word of action' becomes 'verb' (a verb indicates an action).
'every so often' indicates alternate letters.
'being'+'at'='beingat'
The alternating letters of 'beingat' are 'ena'.
'verb' put next to 'ena' is 'VERBENA'.
(Other definitions for verbena that I've seen before include "Herbaceous plant" , "Vervain (plant)" , "Ornamental plant with showy flowers" , "Garden plant" , "Ornamental pant" .)