Soldier to enjoy joining married model (8)
I believe the answer is:
paradigm
'model' is the definition.
(I know that paradigm is a type of model)
'soldier to enjoy joining married' is the wordplay.
'soldier' becomes 'para' (paratrooper).
'to enjoy' becomes 'dig' (to dig can mean to appreciate or 'get').
'joining' says to put letters next to each other.
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'para'+'dig'+'m'='PARADIGM'
(Other definitions for paradigm that I've seen before include "Example, model or pattern" , "Archetype" , "Framework or typical example" , "Model or example for rapid agm" , "Pattern - exemplar" .)