Partner to bump in erotic dance routine? (5)
I believe the answer is:
grind
'erotic dance routine?' is the definition.
'grind' can be an answer for 'routine?' (I've seen this in another clue). I am unsure of the 'erotic dance' bit.
'partner to bump in' is the wordplay.
'partner' becomes 'n'.
'to bump' becomes 'grid' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' is an insertion indicator.
'n' put within 'grid' is 'GRIND'.
Can you help me to learn more?
(Other definitions for grind that I've seen before include "Monotonous, routine work" , "To prepare coffee beans" , "Reduce to small pieces by pounding or abrading" , "Pound" , "Jar" .)