Some song regularly sung at church (6)
I believe the answer is:
snatch
'some song' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?
'regularly sung at church' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'church' becomes 'ch' (abbreviation on maps etc).
The alternate letters of 'sung' are 'sn'.
'sn'+'at'+'ch'='SNATCH'
Can you help me to learn more?
(Other definitions for snatch that I've seen before include "Dense clump of grass" , "Appropriate" , "fragment of tune" , "Few bars of music - grab" , "Weightlifting manoeuvre" .)