Feeling round the back (5)

I believe the answer is:
hunch
This could be a double definition.
'feeling' is the first definition.
(hunch is a kind of feeling)
'round the back' is the second definition.
'hunch' can be an answer for 'round' (thesaurus). I'm not certain of the 'the back' bit.
Can you help me to learn more?
(Other definitions for hunch that I've seen before include "Intuition, suspicion" , "Lump - intuitive feeling" , "Inkling" , "Bend over" , "Vague suspicion" .)
