Declare a saintly brew of tea! (5)
I believe the answer is:
state
'declare' is the definition.
(I know that declare is a more specific form of the action state)
'a saintly brew of tea' is the wordplay.
'a saintly brew' becomes 'st' (I can't justify this - if you can you should give a lot more credence to this answer).
'of' indicates an anagram (the answer comes from or 'of' the letters).
'tea' is an anagram of 'ate'.
'st'+'ate'='STATE'
Can you help me to learn more?
(Other definitions for state that I've seen before include "Say; country" , "Claim" , "Speak" , "Condition of country." , "Government; say" .)