Kiss a little, turning head away (4)
I believe the answer is:
peck
'kiss' is the definition.
(I know that kiss can be written as peck)
'a little turning head away' is the wordplay.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'little' means to remove the last letter (the word is not quite complete).
'turning head away' becomes 'ck' (I can't explain this - if you can you should give a lot more credence to this answer).
'per' with its last letter taken away is 'pe'.
'pe'+'ck'='PECK'
Can you help me to learn more?
(Other definitions for peck that I've seen before include "Large number" , "lot of pints" , "quantity of dry stuff" , "Light kiss; measure" , "Kiss; old dry measure" .)