Chant wildly and informally, as you'd expect (5)
I believe the answer is:
natch
'informally as you'd expect' is the definition.
I can't tell whether this definition defines the answer.
'chant wildly' is the wordplay.
'wildly' is an anagram indicator.
'chant' with letters rearranged gives 'NATCH'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for natch that I've seen before include "Of course! (US sl.)" , "a display of Indian dancing" , "Of course, commonly < , behind" , "obviously" .)