Cry about one’s flab? (7)
I believe the answer is:
blubber
'cry about one's flab?' is the definition.
'blubber' can be an answer for 'cry' (blubbering is a kind of crying). I'm not certain of the 'about one's flab?' bit.
'cry about one's flab?' is the wordplay.
'cry' becomes 'blub' (I've seen this before).
'about one's flab?' becomes 'ber' (I can't explain this - if you can you should give a lot more credence to this answer).
'blub'+'ber'='BLUBBER'
Can you help me to learn more?
(Other definitions for blubber that I've seen before include "source of oil" , "Fatty tissue of a whale" , "Cry -- whale fat" , "Layer of fat under the skin of whales" , "Insulating fat" .)