Give a chap tea, perhaps (6)
I believe the answer is:
donate
'give' is the definition.
(donating is a kind of giving)
'a chap tea perhaps' is the wordplay.
'a chap' becomes 'don' (**).
'perhaps' is an anagram indicator.
'tea' anagrammed gives 'ate'.
'don'+'ate'='DONATE'
(Other definitions for donate that I've seen before include "Contribute (to charity)" , "Give money to charity" , "Give as gift, say blood" , "Give (transplant organ)" , "Contribute charitably" .)