Capable of growing common if gender is mistaken (5-8)
I believe the answer is:
green-fingered
'capable of growing' is the definition.
The definition suggests an adjective which matches the answer.
'common if gender is mistaken' is the wordplay.
'common' becomes 'green' (synonyms).
'is mistaken' is an anagram indicator.
'if'+'gender'='ifgender'
'ifgender' anagrammed gives 'fingered'.
'green'+'fingered'='GREEN-FINGERED'
Can you help me to learn more?
(Other definitions for green-fingered that I've seen before include "Having aptitude at growing plants" , "Horticulturally talented!" , "Having the knack of making plants grow well" , "Adept at gardening" , "With a talent for growing things" .)