The following question is motivated by this answer at ELL. Here, I'm not interested in the correctness (that's already been answered at ELL) but in the possibility of interpreting this construction as an it-cleft.
Clefting is a construction by which a single sentence is broken up into two clauses so that the clause moved to the front receives more emphasis.
For example, given the sentence:
Police rarely arrest people without adequate suspicion.
Imagine that we want to emphasize people without adequate suspicion, then we would write:
It is people without adequate suspicion that police rarely arrest.
The question I want to ask is whether I can use an it-cleft to emphasize an adverb. In the sample sentence, imagine that we want to emphasize how rarely this happens, then we would write:
It is rarely that police arrest people without adequate suspicion.