One churchman or another bottling gas (6)
I believe the answer is:
deacon
'one churchman' is the definition.
(I've seen this before)
'another bottling gas' is the wordplay.
'another' becomes 'dean' (I can't explain this - if you can you should give a lot more credence to this answer).
'bottling' means one lot of letters goes inside another (bottling is a kind of containing).
'gas' becomes 'co' (CO is carbon monoxide).
'dean' going around 'co' is 'DEACON'.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for deacon that I've seen before include "Layman attending to church duties" , "Clergyman of low rank" , "Cleric ranking just below a priest in Christian churches" , "Cleric - canoed (anag)" , "Rank of clergy" .)