He provided queen with young beast (6)
I believe the answer is:
heifer
'young beast' is the definition.
'heifer' can be an answer for 'beast' (I've seen this before). I am unsure of the 'young' bit.
'he provided queen' is the wordplay.
'provided' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny').
'queen' becomes 'ER' (short for Elizabeth Regina ie Queen Elizabeth).
'he'+'if'+'er'='HEIFER'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for heifer that I've seen before include "Young cow which has not yet given birth" , "a little lower" , "Farm animal" , "Cow that has borne one or no calves" , "beast" .)