Water pipe goes wonky, swamping forest hotel (6,4)

'water pipe' is the definition.

'goes wonky swamping forest hotel' is the wordplay.
'wonky' is an anagram indicator (the original order is disrupted or wonky ).
'swamping' means one lot of letters goes inside another (swamp can mean to surround or smother).
'forest' becomes 'arden' (I've seen this before).
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'goes' anagrammed gives 'gose'.
'arden'+'h'='ardenh'
'gose' enclosing 'ardenh' is 'GARDEN HOSE'.