Wordy lines about personal problem (7)
I believe the answer is:
verbose
'wordy' is the definition.
(I know that wordy can be written as verbose)
'lines about personal problem' is the wordplay.
'lines' becomes 'verse' (lines of poetry).
'about' means one lot of letters goes inside another.
'personal problem' becomes 'bo' (informal abbreviation for body odour).
'verse' going around 'bo' is 'VERBOSE'.
(Other definitions for verbose that I've seen before include "Loquacious" , "Using more words than necessary" , "With an excess of words" , "Irritatingly long-winded" , "Circumlocutory" .)