It supports a climbing animal without comment (5)
I believe the answer is:
tacit
'without comment' is the definition.
I can't judge whether this defines the answer.
'it supports a climbing animal' is the wordplay.
'supports' is a charade indicator (letters next to each other) (bottom letters provide a support for the top ones).
'a climbing' shows that the letters should be reversed in order (in a down clue, letters climb up).
'animal' becomes 'cat' (I've seen this before).
'cat' in reverse letter order is 'tac'.
'it' put after 'tac' is 'TACIT'.
Can you help me to learn more?
(Other definitions for tacit that I've seen before include "Implicitly understood" , "Not said though understood" , "Understood, not spoken or played" , "Implicit, unspoken" , "Respect, admiration" .)