Standing about and outdoing when it comes to eating (7)
I believe the answer is:
eroding
'it comes to eating' is the definition.
The definition suggests a singular noun which matches the answer.
'standing about and outdoing when' is the wordplay.
'standing' is a reversal indicator (in a down clue, letters stand up).
'about' becomes 're' (regarding).
'and' means one lot of letters go next to another.
'outdoing when' becomes 'oding' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
're' written backwards gives 'er'.
'er'+'oding'='ERODING'
Can you help me to learn more?
(Other definitions for eroding that I've seen before include "Gradually wearing away, rock say" , "Wearing away with time" , "chipping away" , "eating away" .)