Was in charge of waves or particles (7)
I believe the answer is:
oversaw
'was in charge' is the definition.
I can't tell whether this defines the answer.
'waves or particles' is the wordplay.
'particles' indicates an anagram (the same parts or particles in a new order).
'waves'+'or'='wavesor'
'wavesor' anagrammed gives 'OVERSAW'.
'of' is the link.
Can you help me to learn more?
(Other definitions for oversaw that I've seen before include "Managed" , "What supervisor did" , "Supervised" , "watcher" .)