Tango on ice mostly is something refreshing! (5)
I believe the answer is:
tonic
'refreshing' is the definition.
(I know that refreshing can be written as tonic)
'tango on ice mostly' is the wordplay.
'tango' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'mostly' means to remove the last letter (most but not all of the word).
'ice' with its last letter removed is 'ic'.
't'+'on'+'ic'='TONIC'
'is something' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for tonic that I've seen before include "medicinal preparation" , "something invigorating" , "requirement for invigoration?" , "__water; gin mixer" , "An enlivener" .)