Worry about paper clips (4)
I believe the answer is:
fret
'worry' is the definition.
(to fret about something is to worry)
'about paper clips' is the wordplay.
I cannot really see how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is located in the answer.
'paper' could be 'ft' (newspaper the FT, Financial Times) and 'ft' is found in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for fret that I've seen before include "Become unhappy, worry" , "Worry about doing woodwork?" , "Mist coming in from the sea" , "Be anxious -- part of a fingerboard" , "Part of a Gibson, say" .)