Take back, starting to serve time without church soup (7)

'soup' is the definition.
(borscht is a kind of soup)

'take back starting to serve time without church' is the wordplay.
'take back' becomes 'bor' (I can't justify this - if you can you should give a lot more credence to this answer).
'starting to' says to take the initial letters.
'without' means one lot of letters goes inside another ('without' can be similar in meaning to 'outside').
'church' becomes 'ch' (common abbreviation).
The first letters of 'serve time' is 'st'.
'st' going around 'ch' is 'scht'.
'bor'+'scht'='BORSCHT'

Can you help me to learn more?