Doctor grasps paper by cooler physicist (5)
I believe the answer is:
dirac
'physicist' is the definition.
(I've seen this before)
'doctor grasps paper by cooler' is the wordplay.
'doctor' becomes 'dr' (abbreviation).
'grasps' means one lot of letters goes inside another (inserted letters are held or grasped).
'paper' becomes 'i' (the i is a UK newspaper).
'by cooler' becomes 'ac' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'dr' enclosing 'i' is 'dir'.
'dir'+'ac'='DIRAC'
Can you help me to learn more?
(Other definitions for dirac that I've seen before include "constant originator" , "English physicist" , "Nobel Prize winner" , "Scientist" , "Paul -, physicist; I'd arc (anag.)" .)