May baby's nature appear at first unusual? (7)
I believe the answer is:
'may baby's' is the definition.
(someone whose star sign is Taurus)
'nature appear at first unusual?' is the wordplay.
'at first' indicates taking the first letters.
'unusual?' indicates an anagram (I've seen 'unusual' mean this).
The initial letter of 'appear' is 'a'.
'naturea' with letters rearranged gives 'TAUREAN'.
(Other definitions for taurean that I've seen before include "One born in April/May" , "person who might be considered bullish?" , "bovine" , "One born under the sign of the bull" , "May Day baby, say?" .)