Clue: Look at Bottom –– unconstrained, asinine, and beginning to heehaw. Would a fairy call for this? (3,5)
Answer: EYE TOOTH
Explanation: Definition: Would a fairy call for this?

**EYE** ("look at") + ***(otto)** [anag:*asinine*] + *[beginning to*] **H**(eehaw), where OTTO is (b)OTTO(m) *unconstrained