Heavens! Time to get back to make the ice-cream! (6)
I believe the answer is:
cornet
'the ice-cream' is the definition.
(I've seen this before)
'heavens time to get back to make' is the wordplay.
'heavens time' becomes 'roc' (I can't justify this - if you can you should believe this answer much more).
'to get back' is a reversal indicator (I've seen 'got back' mean this).
'to make' becomes 'net' (I've seen this in another clue).
'roc' in reverse letter order is 'cor'.
'cor'+'net'='CORNET'
Can you help me to learn more?
(Other definitions for cornet that I've seen before include "Musical instrument - ice cream" , "Ice cream cone" , "A short trumpet or ice-cream holder" , "Small trumpet or ice cream holder" , "play this?" .)