Something you can't touch landed in boat (6,3)
I believe the answer is:
sacred cow
'something you can't touch' is the definition.
(something that cannot be criticised)
'landed in boat' is the wordplay.
'landed' becomes 'acred' (I've seen this in another clue).
'in' indicates putting letters inside.
'boat' becomes 'scow' (scow is a kind of boat).
'acred' placed inside 'scow' is 'SACRED COW'.
(Other definitions for sacred cow that I've seen before include "one's above criticism?" , "Idea above criticism" , "Thing regarded as beyond criticism" , "one not to be criticised" , "Shibboleth" .)