For greeting bow to each side (6)
I believe the answer is:
behind
'each side' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'for greeting bow' is the wordplay.
I cannot really understand how this works, but
'greeting' could be 'hi' (hi is a kind of greeting) and 'hi' is found in the answer.
'bow' could be 'bend' (I've seen this in another clue) and 'bend' is found in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for behind that I've seen before include "support" , "Serving time" , "Not in front" , "Following - late" , "In arrears; guiding" .)