Polish off edge of speed skating arena (5)
I believe the answer is:
drink
'polish off' is the definition.
The answer and definition can be both related to consumption as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'edge of speed skating arena' is the wordplay.
'edge of' indicates one should take the final letters (one of the letters on the edge of the word).
'skating arena' becomes 'rink' (I've seen this before).
The final letter of 'speed' is 'd'.
'd'+'rink'='DRINK'
Can you help me to learn more?
(Other definitions for drink that I've seen before include "effect rehydration" , "Tipple" , "Possibly shake" , "Sup" , "Imbibe" .)