Current king in Hamlet panned (7)
I believe the answer is:
thermal
'current' is the definition.
(I've seen this before)
'king in hamlet panned' is the wordplay.
I cannot quite understand how this works, but
'king' could be 'er' (abbreviation for Edward Rex, various English kings) and 'er' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for thermal that I've seen before include "type of baths" , "Her malt became heat-related" , "Relating to heat" , "Related to heat" , "Warm or hot - underwear?" .)