GM opening wine and cigar regularly gets complaint (8)

'complaint' is the definition.
(astigmia is a kind of health problem)

'gm opening wine and cigar regularly' is the wordplay.
'opening' means one lot of letters goes inside another (some letters open a gap in others).
'wine' becomes 'asti' (Italian wine).
'and' means one lot of letters go next to another.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'cigar' are 'ia'.
'asti'+'ia'='astiia'
'gm' inserted within 'astiia' is 'ASTIGMIA'.

'gets' acts as a link.