Russian resort closed off by staff, one happy to suffer (9)
I believe the answer is:
masochist
'one happy to suffer' is the definition.
I can't tell whether this defines the answer.
'russian resort closed off by staff' is the wordplay.
I cannot really see how this works, but
'russian resort' could be 'sochi' (resort city in Russia) and 'sochi' is found within the answer.
'staff' could be 'mast' and 'mast' is located in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for masochist that I've seen before include "one enjoying humiliation" , "deviant"" , "One who likes pain" .)