34 A is Additional or incidental information (9). The letters are:
S?D?L?G?T
The only word I can find to fit the letters is SIDELIGHT. Could you please explain how SIDELIGHT is the answer to the clue.
sidelight
a piece of incidental information that helps to clarify or enliven a subject.
"one has to wade through pages of extraneous material in order to discover these sidelights on the management of an estate"