Lads err, rearranging pantries (7)
I believe the answer is:
larders
'pantries' is the definition.
('larder' can be a synonym of 'pantry')
'lads err rearranging' is the wordplay.
'rearranging' indicates anagramming the letters (I've seen 'rearranged' mean this).
'lads'+'err'='ladserr'
'ladserr' with letters rearranged gives 'LARDERS'.
(Other definitions for larders that I've seen before include "Pantries" , "Small food storerooms" , "Food stores" .)