Give ground on the transport carrying Her Majesty (7)
I believe the answer is:
terrain
'give ground' is the definition.
'terrain' can be an answer for 'ground' (I've seen this before). I'm not sure about the 'give' bit.
'the transport carrying her majesty' is the wordplay.
'the transport' becomes 'train' (train is a kind of transport).
'carrying' means one lot of letters goes inside another.
'her majesty' becomes 'er' (Elizabeth Regina).
'train' placed around 'er' is 'TERRAIN'.
'on' is the link.
Can you help me to learn more?
(Other definitions for terrain that I've seen before include "Landscape" , "Piece of ground" , "Land (as base for action)" , "Land (viewed tactically)" , "Ground (conditions)" .)