Frank gains the new seat - these wanted it too (10)
I believe the answer is:
candidates
'these wanted it too' is the definition.
The definition suggests an adverb but the answer is not.
'frank gains the new seat' is the wordplay.
'frank' becomes 'candid' (synonyms).
'gains' is a charade indicator (letters next to each other).
'the new' is an anagram indicator.
'seat' anagrammed gives 'ates'.
'candid'+'ates'='CANDIDATES'
Can you help me to learn more?
(Other definitions for candidates that I've seen before include "Entrants" , "those awaiting interview?" .)