Stand on three legs? (6)
I believe the answer is:
tripod
'stand on three legs?' is the definition.
(I've seen this before)
'on three legs?' is the wordplay.
'on' says to put letters next to each other.
'three' becomes 'tri' (prefix meaning 'three').
'legs?' becomes 'pod' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tri' next to 'pod' is 'TRIPOD'.
Can you help me to learn more?
(Other definitions for tripod that I've seen before include "Torpid (anag.)" , "Three-legged stand as for camera" , "Something on three legs" , "support called for" , "Drop it (anag)" .)