They pose remarkably seldom (6)
I believe the answer is:
models
'they pose' is the definition.
Although both the answer and 'pose' are verbs, they are not in the same form of the verb.
'remarkably seldom' is the wordplay.
'remarkably' is an anagram indicator (I've seen this in other clues).
'seldom' with letters rearranged gives 'MODELS'.
Can you help me to learn more?
(Other definitions for models that I've seen before include "Mannequins or examplars" , "Clothes-horses" , "Poses for artists" , "Representative forms or patterns" , "Seldom (anag)" .)