Get half-hearted supporters descending on church (5)
I believe the answer is:
fetch
'get' is the definition.
(I know that get can be written as fetch)
'half-hearted supporters descending on church' is the wordplay.
'half hearted supporters' becomes 'fet' (I can't explain this - if you can you should believe this answer much more).
'descending on' means one lot of letters go next to another (in a down clue, some letters go on top of others).
'church' becomes 'ch' (common abbreviation).
'fet'+'ch'='FETCH'
Can you help me to learn more?
(Other definitions for fetch that I've seen before include "double" , "Collect" , "Order to dog to retrieve thrown stick" , "Sell for" , "Command to a gun dog" .)