They pose remarkably seldom (6)
'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' indicates anagramming the letters (I've seen this in other clues).
'seldom' anagrammed 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)".)