Cook and Hudson - old proles shocked to receive King (9)
I believe the answer is:
explorers
'cook and hudson' is the definition.
I can't judge whether this defines the answer.
'old proles shocked to receive king' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'shocked' is an anagram indicator (letters are shocked or disrupted).
'to receive' is an insertion indicator.
'king' becomes 'r' (abbreviation for rex, king in Latin).
'proles' anagrammed gives 'ploers'.
'ploers' enclosing 'r' is 'plorers'.
'ex'+'plorers'='EXPLORERS'
Can you help me to learn more?
(Other definitions for explorers that I've seen before include "They travel in unknown regions" , "Early 11 satellites" , "They thoroughly examine" , "Scott, Shackleton etc." .)