Water slide appealing when it's hot inside (5)
I believe the answer is:
chute
'water slide' is the definition.
(chute can mean a water slide)
'appealing when it's hot inside' is the wordplay.
'appealing when' becomes 'cute' (I've seen this before. I am not sure about the 'when' bit.).
'it's hot' becomes 'h' (abbreviation, eg on taps).
'inside' indicates putting letters inside.
'cute' enclosing 'h' is 'CHUTE'.
Can you help me to learn more?
(Other definitions for chute that I've seen before include "Waterfall" , "Inclined channel for rubbish, laundry etc" , "Sloping trough" , "Slide" , "Flume" .)