Old King Henry: a row recalled in pub (7)
I believe the answer is:
pharaoh
'old king' is the definition.
'pharaoh' can be an answer for 'king' (I've seen this before). I am not certain of the 'old' bit.
'henry a row recalled in pub' is the wordplay.
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'row' becomes 'oar' (oar can mean to row with oars).
'recalled' shows that the letters should be reversed in order (to recall can mean to bring something back).
'in' indicates putting letters inside.
'pub' becomes 'ph' (abbreviation).
'oar' reversed gives 'rao'.
'h'+'a'+'rao'='harao'
'harao' placed into 'ph' is 'PHARAOH'.
Can you help me to learn more?
(Other definitions for pharaoh that I've seen before include "Ancient Egyptian king" , "Now mummy" , "Eg, Tutankhamen" , "Former Egyptian ruler" , "Ancient Egyptian ruler" .)