それは雲をつかむような話だ。

that (indicating an item or person near the listener, the action of the listener, or something on their mind); it; that time; then; there (indicating a place near the listener); you

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

cloud

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to seize; to catch; to grasp; to grip; to grab; to hold; to catch hold of; to lay one's hands on; to clutch; to understand; to grasp; to comprehend

(usu. at sentence-end) seeming to be; appearing to be; like; similar to; in order to (e.g. meet goal); so that; indicates hope, wish, request or mild command

talk; speech; chat; story; conversation; discussions; negotiation; argument

be; is; indicates past or completed action; indicates light imperative