Is husband following obscure unknown figure, being out-of-date? (7)

'out-of-date?' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'is husband following obscure unknown figure' is the wordplay.
'husband' becomes 'h'.
'following' is a charade indicator (letters next to each other).
'obscure' becomes 'fog' (synonyms).
'unknown figure' becomes 'y' (unknown value in algebra).
'is'+'h'='ish'
'fog'+'y'='fogy'
'ish' after 'fogy' is 'FOGYISH'.

'being' acts as a link.