One probes bad lot misbehaving (7)
I believe the answer is:
tabloid
'one probes bad lot misbehaving' is the definition.
I can't tell whether this defines the answer.
'one probes bad lot misbehaving' is the wordplay.
'one' becomes 'i' (Roman numeral).
'probes' means one lot of letters goes inside another (probe can mean to poke or prod into).
'misbehaving' is an anagram indicator.
'bad'+'lot'='badlot'
'badlot' with letters rearranged gives 'tablod'.
'i' going into 'tablod' is 'TABLOID'.
Can you help me to learn more?
(Other definitions for tabloid that I've seen before include "Ad lib to get lowbrow newspaper" , "Popular newspaper size" , "A bit old (anag)" , "Small-format newspaper" , "Not our sort of paper" .)