Unconventional nature constrains a child born on May Day (7)
I believe the answer is:
taurean
'child born on may day' is the definition.
I know nothing about this answer so I can't tell whether this works.
'unconventional nature constrains a' is the wordplay.
'unconventional' indicates anagramming the letters.
'constrains' means one lot of letters goes inside another.
'nature' is an anagram of 'turean'.
'turean' going around 'a' is 'TAUREAN'.
Can you help me to learn more?
(Other definitions for taurean that I've seen before include "bovine" , "One born in April/May" , "May Day baby, say?" , "One born under the sign of the bull" , "person who might be considered bullish?" .)