Asian mountaineer eats her partner's sandwiches (6)
I believe the answer is:
sherpa
'asian mountaineer' is the definition.
(Himalayan mountain guide)
'eats her partner's sandwiches' is the wordplay.
'sandwiches' indicates the answer is hidden within the clue (the solution is sandwiched in by the clue).
'SHERPA' is hidden in the letters of 'eats her partners'.
(Other definitions for sherpa that I've seen before include "Mountain dweller" , "Himalayan dweller" , "Himalayan - phrase (anag)" , "Skilled mountaineer of the Himalayas" , "Phrase for a native Himalayan climber" .)