Turned a limb to ice (6)
I believe the answer is:
gelato
'ice' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'turned a limb to' is the wordplay.
'turned' is a reversal indicator.
'limb' becomes 'leg' (leg is a kind of limb).
'a'+'leg'='aleg'
'aleg' in reverse letter order is 'gela'.
'gela'+'to'='GELATO'
Can you help me to learn more?
(Other definitions for gelato that I've seen before include "Frozen food" , "Italian-style ice cream" , "Italian ice cream" , "treat in Milan?" .)