Crossword Genius

Sillier soldier and daughter ride off (7)

Ross

I believe the answer is:

giddier

'sillier' is the definition.
('giddy' can be a synonym of 'silly')

'soldier and daughter ride off' is the wordplay.
'soldier' becomes 'GI' (GI can mean a US soldier).
'and' is a charade indicator (letters next to each other).
'daughter' becomes 'd' (genealogical abbreviation).
'off' indicates anagramming the letters.
'ride' is an anagram of 'dier'.
'gi'+'d'+'dier'='GIDDIER'

(Another definition for giddier that I've seen is " More dizzy".)

I've seen this clue in the Sydney Morning Herald.
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