Hathaway gets cross when they take over her territory (5)
I believe the answer is:
annex
'they take over her territory' is the definition.
The definition suggests an adverb but the answer is not.
'hathaway gets cross' is the wordplay.
'hathaway' becomes 'anne' (I've seen this in another clue).
'gets' is a charade indicator (letters next to each other).
'cross' becomes 'x' (X is cross-shaped).
'anne'+'x'='ANNEX'
'when' acts as a link.
Can you help me to learn more?
(Other definitions for annex that I've seen before include "Addition to a document" , "Tack on" , "Attach after conquest" , "Join - add" , "Add to one's territory" .)