Think shop needs rebuke (10)
I believe the answer is:
Here is my best explanation:
'think' is the definition.
'shop needs rebuke' is the wordplay.
'shop' becomes 'deli' (deli is a kind of shop).
'needs' is a charade indicator (letters next to each other).
'rebuke' becomes 'berate' ('berate' can be a synonym of 'rebuke').
(Other definitions for deliberate that I've seen before include "Planned", "Calculated - think carefully", "Done intentionally", "Intentional; think carefully", "Premeditated", "debate", "Cautious", "Done consciously", "Consider - intentional" and "Muse".)