Queen once given kiss as appropriate (5)
I believe the answer is:
annex
'appropriate' is the definition.
(annexing is a kind of appropriating)
'queen once given kiss' is the wordplay.
'queen once' becomes 'anne' (Queen Anne, 18th-century queen).
'given' means one lot of letters go next to another.
'kiss' becomes 'x' (X can represent a kiss).
'anne'+'x'='ANNEX'
'as' is the link.
(Other definitions for annex that I've seen before include "Add by conquest or occupation" , "Add to one's territory" , "Appropriate" , "Seize" , "Grab" .)