Essentially dice and slice bananas to make frozen stuff (7)
I believe the answer is:
icicles
'to make frozen stuff' is the definition.
I can't tell whether this definition defines the answer.
'essentially dice and slice bananas' is the wordplay.
'essentially' means to look at the middle letters.
'and' is a charade indicator (letters next to each other).
'bananas' indicates anagramming the letters (informal term for mad).
The middle of 'dice' is 'ic'.
'slice' with letters rearranged gives 'icles'.
'ic'+'icles'='ICICLES'
Can you help me to learn more?
(Other definitions for icicles that I've seen before include "Frozen drips" , "Hanging spikes of frozen water" , "Frozen pendants" , "Pendent spears of frozen water (7)" , "'When ... hang by the wall / And Dick the shepherd blows his nail' (Shakespeare)" .)