Firm, stable worker admitted to tremendous honour (8)
I believe the answer is:
accolade
'honour' is the definition.
(synonyms)
'firm stable worker admitted to tremendous' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'stable worker' becomes 'lad' (I've seen this before).
'admitted to' means one lot of letters goes inside another.
'tremendous' becomes 'ace' (I can't explain this - if you can you should give a lot more credence to this answer).
'co'+'lad'='colad'
'colad' inserted into 'ace' is 'ACCOLADE'.
Can you help me to learn more?
(Other definitions for accolade that I've seen before include "Praise, acclaim" , "Praise or approval - or elevation to knighthood" , "Special recognition of merit" , "Tribute expressing great approval" , "High praise" .)