Finally resting, sleeps with grace, tho' moving service here? (2,7,6)

'service here?' is the definition.
(Chapel in Windsor Castle)

'finally resting sleeps with grace tho' moving' is the wordplay.
'finally' says to take the final letters.
'with' means one lot of letters go next to another.
'moving' indicates an anagram.
The last letter of 'resting' is 'g'.
'g'+'sleeps'+'grace'+'tho'='gsleepsgracetho'
'gsleepsgracetho' anagrammed gives 'ST GEORGE'S CHAPEL'.