When messy, stand up for cleaning receptacle (7)
I believe the answer is:
dustpan
'cleaning receptacle' is the definition.
'dustpan' can be an answer for 'receptacle' (dustpan is a kind of receptacle). I am not sure about the 'cleaning' bit.
'when messy stand up' is the wordplay.
'when messy' indicates anagramming the letters.
'stand'+'up'='standup'
'standup' anagrammed gives 'DUSTPAN'.
'for' is the link.
Can you help me to learn more?
(Other definitions for dustpan that I've seen before include "waste collector" , "Rubbish, one gathers" , "A brush goes with it" , "What's frequently found by a brush -- stand up (anag)" , "part of housemaid's kit" .)