What's gastric band somehow gathering in for some Londoners? (7)
I believe the answer is:
abdomen
'what's gastric' is the definition.
I can't tell whether this definition defines the answer.
'band somehow gathering in for some londoners?' is the wordplay.
'somehow' is an anagram indicator.
'gathering' is an insertion indicator (gather can mean to acquire or bring in).
'in for some londoners?' becomes 'ome' ('home' - 'he's in' can mean 'he's home' - said with a cockney accent, dropping the 'H').
'band' anagrammed gives 'abdn'.
'abdn' going around 'ome' is 'ABDOMEN'.
Can you help me to learn more?
(Other definitions for abdomen that I've seen before include "Part of body containing the digestive organs" , "gut" , "Part of body containing the stomach" , "corporation's site" , "4 part of insect" .)