Supports without spur in greenhouse containers (4)
I believe the answer is:
Here is my best explanation:
'greenhouse containers' is the definition.
'pots' can be an answer for 'containers' (pot is a kind of container). I am not sure about the 'greenhouse' bit.
'supports without spur' is the subsidiary indication.
'without' suggests deleting specific letters.
'supports' with 'spur' taken out is 'pots'.
'in' is the link.
(Other definitions for pots that I've seen before include "Gets (a ball) into pocket", "Preserves", "Ceramics; pockets (ball)", "Containers; oodles", "Cooking utensils", "earthenware here" and "Stop (anag.)".)