Father turns up with mother perhaps in sight (8)
I believe the answer is:
apparent
'in sight' is the definition.
(thesaurus)
'father turns up with mother perhaps' is the wordplay.
'father' becomes 'pa' (pa is a kind of father).
'turns up' shows that the letters should be reversed in order.
'with' says to put letters next to each other.
'mother perhaps' becomes 'parent' (mother is a kind of parent**).
'pa' reversed gives 'ap'.
'ap'+'parent'='APPARENT'
(Other definitions for apparent that I've seen before include "Obvious, clearly understood" , "That may be seen" , "Evident, manifest" , "Pane part may be quite obvious" , "Visible - plain - presumable" .)