Pvc panneled door frame- cracked through seem on write angle?

I have a Pvc panneled door, glass at the top, pvc at the bottom,the frame on the bottom write angle seem has been cracked open, though the glue joint and a little of the pvc is also cracked,after being knocked.
Does this need proffesional glue and clamping,
and will it need to be remove from the frame to do this work?

Also the black rubber seal that goes all round the door has streched by a inch over hang on the corner,could i just cut extra off?
and would it still stay in the grove, without glue?

I hope I've explaned this well enough.
Many thanks, for any Help.