Don leaves motherland, travelling for warmth (7)
I believe the answer is:
thermal
'warmth' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'don leaves motherland travelling' is the wordplay.
'leaves' is a deletion indicator.
'travelling' is an anagram indicator.
'motherland' with 'don' removed is 'mtherla'.
'mtherla' with letters rearranged gives 'THERMAL'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for thermal that I've seen before include "Relating to heat" , "Pertaining to heat" , "Warm or hot, say air or spring" , "Warming" , "which can take a glider up" .)