The boys get on with difficulty, carrying the bag (9)
I believe the answer is:
gladstone
'the bag' is the definition.
(Gladstone is an example)
'the boys get on with difficulty carrying' is the wordplay.
'the boys' becomes 'lads' (lad is a kind of boy).
'with difficulty' indicates anagramming the letters.
'carrying' means one lot of letters goes inside another.
'get'+'on'='geton'
'geton' with letters rearranged gives 'gtone'.
'lads' put into 'gtone' is 'GLADSTONE'.
(Other definitions for gladstone that I've seen before include "Former English PM or kind of bag" , "Old English P.M. or a doctor's bag" , "Politician" , "19th-century prime minister" , "Doctor's bag or old British PM" .)