Trademark securing maybe the Queen’s island in the travel industry (7)
I believe the answer is:
tourism
'the travel industry' is the definition.
(I've seen this before)
'trademark securing maybe the queen's island' is the wordplay.
'trademark' becomes 'tm' (abbreviation for trademark).
'securing' is an insertion indicator.
'maybe the queen's' becomes 'our' ('our' can mean belonging to a monarch).
'island' becomes 'is'.
'our'+'is'='ouris'
'tm' going around 'ouris' is 'TOURISM'.
'in' is the link.
(Other definitions for tourism that I've seen before include "Holiday industry" , "The business of providing services to visitors" , "Organisation of holidays" , "going places" , "Travel for pleasure" .)