The odd supper from Spain that's cold and hot in a manner of speaking (6)
I believe the answer is:
speech
'manner of speaking' is the definition.
(synonyms)
'the odd supper from spain that's cold' is the wordplay.
'the odd' indicates alternate letters.
'from' says to put letters next to each other.
'spain' becomes 'e' (abbreviation for Espana).
'that's cold' becomes 'ch' (I can't explain this - if you can you should believe this answer much more).
The alternating letters of 'supper' are 'spe'.
'spe'+'e'+'ch'='SPEECH'
'and hot in a' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for speech that I've seen before include "Talking - language - oration" , "Giving address" , "The business of talking" , "Verbal communication" , "'Utterance, talk (6)'" .)