On heat, bother male bears (7)
I believe the answer is:
thermal
'on heat' is the definition.
(I know this)
'bother male bears' is the wordplay.
'THERMAL' is hidden within the letters.
But, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for thermal that I've seen before include "Her malt became heat-related" , "Upward current of warm air" , "which can take a glider up" , "Warm or hot - underwear?" , "Related to heat" .)