Lines from overworked phrases lacking power (9)
I believe the answer is:
latitudes
'lines' is the definition.
(I know this)
'overworked phrases lacking power' is the wordplay.
'overworked phrases' becomes 'platitudes' (platitudes are cliched or overworked phrases).
'lacking' indicates named letters should be taken away.
'power' becomes 'p'.
'platitudes' with 'p' removed is 'LATITUDES'.
'from' acts as a link.
(Other definitions for latitudes that I've seen before include "Angular distances from the equator." , "Region" , "regions north and south" .)