US plane for ground, ocean or fire (3,5,3)
I believe the answer is:
air force one
'us plane' is the definition.
'air force one' can be an answer for 'plane' (I have seen 'Presidential plane' mean 'air force one' so perhaps 'plane' could also mean 'air force one'). I am not sure about the 'us' bit.
'ground ocean or fire' is the wordplay.
'ground' indicates an anagram ('grind' the letters into a new form).
'ocean'+'or'+'fire'='oceanorfire'
'oceanorfire' is an anagram of 'AIR FORCE ONE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for air force one that I've seen before include "Film" , "VIP transport" , "US presidential plane" .)