Father reviews parts of speech using modifying words (7)
I believe the answer is:
adverbs
'modifying words' is the definition.
(I've seen this in another clue)
'father reviews parts of speech' is the wordplay.
'father' becomes 'da' (da can mean dad).
'reviews' is a reversal indicator (I've seen 'review' mean this).
'parts of speech' becomes 'verbs' (I've seen this in another clue).
'da' written backwards gives 'ad'.
'ad'+'verbs'='ADVERBS'
'using' is the link.
(Other definitions for adverbs that I've seen before include "quickly, perhaps" , "They qualify or modify other words" , "Parts of speech" , "Modifying words" .)