This is a charade - multiple word parts are joined together in sequence to build the answer.
Break this into three parts: 'Always' gives you the first letter A. 'Come rain or shine' suggests something that goes across all conditions (5 letters). 'Tongue in cheek' with a question mark hints at a different meaning - think of 'cheek' as a facial movement (3 letters).
Answer: ACROSTIC | A (always) + CROSS (come rain or shine, across all conditions) + TIC (cheek as in facial tic, playing on 'tongue in cheek'). An acrostic is a type of poem.