Kind of gene, extremely typical inside (6)
I believe the answer is:
gentle
'kind' is the definition.
(I've seen this before)
'gene extremely typical inside' is the wordplay.
'extremely' means to remove the middle letters.
'inside' indicates putting letters inside.
'typical' with its middle removed is 'tl'.
'gene' going around 'tl' is 'GENTLE'.
'of' is the link.
(Other definitions for gentle that I've seen before include "Kind, not harsh" , "Moderate in effect" , "Kind, not rough" , "Mild and considerate" , "Moderate, quiet; a maggot" .)